/*
 * Copyright (c) 2023-2025 elsfs Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.elsfs.cloud.common.mybatis.ext.sql.support.from;

import lombok.Getter;
import lombok.RequiredArgsConstructor;

/** 标准实现 */
@Getter
@RequiredArgsConstructor
public class StandardFromItem implements FromItem {

  /** 表名 */
  private final String table;

  /** 表别名 */
  private final String tableAlias;

  /**
   * 构建SQL片段
   *
   * @return SQL片段
   */
  @Override
  public String buildSqlFragment() {
    if (this.tableAlias == null) {
      return String.format("FROM %s", this.table);
    }

    return String.format("FROM %s AS %s", this.table, this.tableAlias);
  }
}
